[forktheif]

That's where a lot of antibiotics come from.

Antibiotics that have names ending in -mycin often come from bacteria.

[JulianMorrison]

I wonder if human-caused antibiotic resistance turns around and harms the critters who were originally using that antibiotic as self defense?

[BrandonMarc]

Thanks for that. Is it also true that those ending in -icillin (amoxicillin, penicillin, etc) come from fungi - a major competitor to bacteria? Or am I mistaken?